What best describes an exterior damper's function?

An exterior damper is primarily designed to control airflow within a ventilation system. Its main function is to regulate the amount of air entering or exiting a space, which helps maintain optimal environmental conditions inside a building. By opening or closing in response to various stimuli, such as changes in temperature or pressure, dampers allow for effective management of air movement which is essential for maintaining indoor air quality and energy efficiency.

In the context of ventilation systems, controlling airflow can prevent issues such as drafts, excess humidity, or overexertion of HVAC systems, leading to reduced energy consumption and improved comfort levels. This alignment with airflow management highlights why describing the exterior damper's function as one to control airflow is the most accurate representation of its role in a building's insulation and ventilation strategy.